Compressor



Sept. 5, 1933. H, T. MccAR'rHY COMPRESSOR Filed NOV. 7,. 1930 Har wy 7.7145507@ V y @M mal.

Patented Sept. 5, 1933 y UNITED s'rATrsA e `o'oMPREssoR n Harvey T. McCarthy, Marlboro, Mass. y Application November 7, 19.30. Serial No. 494,148

1 Claim.

The compressor of the present invention is particularly characterized by its reduction of the number of moving parts to a minimum and the` substantial elimination of friction in the opera- 10 tion thereof, so that practically all of the energy of the prime mover driving the compressor is expended in useful work. The above and other advantageous features of the invention will hereinafter more fully appear from the following descriptionr with reference to the accompanying drawing, in which- Fig. 1 is a vertical sectional view of a compressor embodying the invention.

Fig. 2 is a view in end elevation of the parts 20 shown in Fig. 1, viewed from the right hand side.

Fig. 3 is a fragmentary sectional view along the line 3 3 of Fig. 1 looking in the directionof the A arrows. v

Fig. 4 is a fragmentary sectional View similar to Fig. 3 showing the parts in different positions.

Like reference characters refer to like parts throughout the drawing.

Referring first to Figs. 1 and 2, the compressor is illustrated as comprising a casing 1 providing an opening 2 for rotatably receiving the cylindrical trunnion portion 3 of a cylinder 4. The bore 5 of the cylinder 4 extends at right angles to the central axis ofthe trunnion portion 3, so that the cylinder 4, as a Whole, is adapted for pivotal movement Within the opening 2. l

Thecasing 1 is supported from a base 6 providing an upwardly extending web 7 having a bearing portion 8 formed integrally therewith for 4() rotatably supporting a shaft 9. The shaft 9 is adapted to be rotatably driven from any suitable source of power, not shown, the axis of rotation of the shaft 9 extending parallel to the axis of the trunnion 3 of the cylinder 4. The shaft 9 carries beyond thevbearing 8 an eccentric-.disk 10 which is surrounded by a circular yoke 11 formed integrally with a piston 12 fitting the bore 5 of the cylinder 4. As the shaft 9 rotates, it is obvious that the throw of the eccentric disk 10 will impart a reciprocatory movement to the piston 12 within the cylinder 4, which movement will be accompanied by an oscillatory movement of the cylinder 4 about the axis of its trunnion 3, and there will now be described the manner in which the oscillation of the cylinder 4 is utilized to effect porting of the cylinder for the purpose of compressing the uid.

As best shown in Figs. 1 and 3, the casing 1 provides a chamber 13 which is connected by an intake pipe 14 to a source of fluid which it is desired to place under pressure. That portion of the wall of the chamber 13 partially surrounding the opening 2 is provided with a port 15 which is in register with a port 16 provided in the trunnion portion 3 when the piston 12 is moving out of the cylinder 4, as shown in Fig. 1. The upper portion of the casing 1 provides a second chamber 17 connected by a delivery pipe 18 to a suitable system, not shown, to which it is desired to deliver fluid under pressure. That portion of the wall of the chamber 17 partially surrounding the opening 2 provides a port 19 which, in the position of parts shown in Fig. 3, is separated from a port 20 formed in the trunnion portion 3 and displaced from the port 16 by such an angle that the port 20 is always closed, when the port 16 is in communication with the inlet port 15.

As previously pointed out, each complete revolution of the shaft 9 vimparts a reciprocatory movement to the piston 12 within the cylinder 4, accompanied by an oscillatory movement of the trunnion portion 3 within the opening 2. Consequently, as a result of the above described relation between the ports 15, 16 and 19, 20, respectively, outward movement of the piston 12 from the cylinder 4 results in drawing fluid into the cylinder bore 5 from the intake pipe 14. However, as the piston 12 begins its movement into the cylinder 4 oscillatory movement of the trunnion 3 moves the port 16 out of register with the intake port 15, thereby placing the fluid within the cylinder 4 and trunnion 3 under pressure. As the inward movement of the piston 12 continues, turning of the trunnion 3 brings the trunnion port 20 into register with the outlet port 19, thereby discharging uid under pres- 'sure through the outlet pipe 18. As the piston 12 reaches the end of its compression stroke, the port 20 is fully opened, as indicated in Fig. 4, but assoon as the piston 12 starts on its suction stroke, reversal of the direction of movement of the trunnion 3 moves the port 20 out of register with the outlet port 19. Obviously continued movement of the trunnion yportion 3 in the direction of the arrow in Fig. 4 will bring the port 3 16 into register with the intake port 15, the port 20 being fully shut off from the port 19 before the intake port 16 starts to open. v

With the above described functioning of the ports, continued rotation of the shaft 9 will result in the delivery of fluid under pressure to the pipe 18 and when the shaft 9 is rotated at high speed the flow of iiuid under pressure in the pipe 18 is substantially continuous. Since the oscillatory movement of the trunnion portion 3 of the cylinder 4 directly controls the porting of the cylinder, the compressor operates substantially Without frictional losses that are always encountered in the operation of compressors employing reciprocating valve devices. Therefore, substantially all of the energy applied to the shaft 9 is expended in the useful work of compressing the fluid being handled.

From the foregoing, it is apparent that by the present invention there is provided an extremely simple and eiiicient arrangement for controlling the admission of a pressure medium to an oscillatory cylinder unit and its discharge therefrom, the unit operating effectively for-either direction of flow of the medium.

I claim:

In a device of the class described, a housing having a cylindrical seat and providing spaced chambers arranged on opposite sides of said cylindrical seat, a rotatable shaft having Van eccentric thereon, a ring mounted on said eccentric, a cylinder unit providing an integral trunnion portion having ports therein, said trunnion portion being rotatable in said seat on an axis parallel to the axis of said shaft, a piston movable in said cylinder and directly connected to said ring on the eccentric on said shaft, reciprocation of said piston being accompanied by oscillatory movement of said cylinder to cause the admission and discharge of iiuid from said chambers into and from said unit through said ports.

HARVEY T. MCCARTHY. 

